UV filters are often used to block extended UV rays on the front of a lens and as a longtime photographer I remember the days when a UV filter was a must to protect your lenses over the long term. ...or at least that was the theory.

Unfortunately, much of this belief persists to this day, and while the benefits of a UV filter that provides protection is still a hotly debated topic, UV filters offer a very good benefit...they keep dirt/grime/fingerprints back from the front Main element of a camera lens.

In wedding photography, it's not uncommon for a child/baby/drunk adult to reach out and try to touch your lens...in fact, attempts to do so can produce some of the most incredible shots if the timing is right.

However, the expense and difficulty of cleaning a good, high-end lens is often many times more difficult than simply cleaning a lens cover on the front...which is where UV filters usually come in...they do the job good job direct contact with the actual lens.

I've used many different types of filters over my decades of photography, and among these, UV filters are probably the ones that offer the widest range of quality.

This is the first K&F filter I've used and I've been using it on a Sigma ART lens for a week.

I'm happy to say that this filter is a nice mid to high end UV protector. Unlike so many cheaper UV filters, this one doesn't seem to introduce any easily noticeable color shift or image distortion with the image.

While I'm sure if I start pixeling and comparing this UV filter to a $200+ filter I could probably find a few glitches here and there. In fact, this filter is half the price of many of the other upper mid-range filters.

... and let's be honest. The primary goal of a UV filter is protection. A decent UV filter shouldn't noticeably alter your images. In this respect, this product does exactly what it is supposed to.

One thing the K&F excels at, however, is the case in which the filter is packaged.

The case is a hard cylindrical case that is easy to twist open. However, the nicer aspect of this filter is the fact that the housing has a silicone ring with grooves in it that holds the filter in place while it is in the housing. This is something many other manufacturers do NOT (including a large number of more high-end filter manufacturers).

While yes, this is the first real experience with a K&F filter, for me...after looking at the attention to detail they have done, I am now in the market for a few others of theirs :)

With modern DSLR cameras, there is a lot of debate as to whether UV filters are of any use. I'm in the camp that says there are definite benefits. First, there are arguments that the UV filter can protect the sensor in your camera from long-term UV degradation. Second, a good quality filter provides a layer of protection for the front of your camera lens. I was shooting in a very windy location and a door caught the wind and banged the front of my lens before I could get a hold of it. I was lucky that the hit wasn't worse, but the lens got a small chip on the front plastic. This filter is metal, screws directly on, and will protect the front of the lens from such damage in the future. The lens could still be damaged in other ways, but it's a layer of protection from those unexpected bumps. In the future, if the lens gets bumped and the filter destroyed, I'll be grateful that the filter took the hit instead of the lens. The filter is much cheaper to replace!

Perfect for protecting my lens. No chromatic alteration and no color change.
Reasonable price!

This is a simple UV filter. It seems to protect the camera sensor well from UV rays and does not affect the image quality

This UV filter was a great addition to my Tamron 35mm for my Sony. This filter is definitely more of a protector than a modifier, at least in my use case, it helps protect the lens's exposed focusing mechanism and keeps dust or particles out of the lens. Overall I would say this is a great filter for any lens as it creates a barrier between the front element and the world and I have not experienced any negative effects on image quality from having this filter on the lens.

I added this to my Canon Rebel T3i camera. The camera is a few years old and I love it. Cleaning the lens is always a chore, you need to get out the right cloth and be careful not to scratch it! But I can just use my shirt with it. If I scratch it it was $20 and I can get a replacement. I'm really happy with it!

.. and I can't say anything negative. Have several of these for different lenses and never had a glitch

I am still impressed by the devices from K&F Concept. It's well made and the quality of the optical glass and coatings are both really decent. I didn't notice a drop in sharpness.

Optically ok. Compensation good but not perfect. price reasonable.

The filter is very well made, easy to screw in and does not significantly affect the image quality! The packaging, although oversized for a 49mm filter, is also very neat and of high quality.
Unfortunately, the lens hood can no longer be put on because the filter edge is a touch too thick; this is the case with my Sony FE 28mm f2.0. It is therefore unusable for me and is being sent back with a heavy heart.